US2409201A - Smoke-producing mixture - Google Patents

Smoke-producing mixture Download PDF

Info

Publication number
US2409201A
US2409201A US51168043A US2409201A US 2409201 A US2409201 A US 2409201A US 51168043 A US51168043 A US 51168043A US 2409201 A US2409201 A US 2409201A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
metal
mixture
chloride
smoke
oxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Finkelstein Leo
Hervey B Elkins
Original Assignee
Finkelstein Leo
Hervey B Elkins
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C06EXPLOSIVES; MATCHES
    • C06DMEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
    • C06D3/00Generation of smoke or mist (chemical part)

Description

Patented Oct. 15, 1946 UNITED STATES PATENT oFFicEl ff Leo Finkelstein, Aberdeen, Md.,- and Hervey B. Elkins, United States Army No Drawing. Application November 25, 1943, Serial N0. 511,680

, Claims. (01.252-305) -(Grantedunder the act of March 3, 1883, as

The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to us of any royalty thereon.

This invention relates to a smoke-producing mixture which is useful in munitions for producing a smoke of high obscuring power.

Obscuring smoke has proved to be of important tactical value in warfare, and all nations have been busily engaged in developing superior smoke agents. A well known type of smoke agent is the Berger mixture which was used in the last war and which has since been improved in a number of ways. In this type of agent, finely divided metallic Zinc undergoes reaction with an organic chloride. In the reaction the zinc tends to be chlorinated to zinc chloride by the organic chloride which breaks down to liberate free carbon. Unless this type of mixture is modified by added ingredients to oxidize the carbon and modify the reaction, the mixture tends to produce a gray smoke and is somewhat erratic in burning. The modifying agents added to the mixture do not increase the volume of smoke to any substantial extent.

An object of the present invention is to provide a smoke-producing mixture which can be used in all types of munitions in which the Berger mixture type has been used as a filling and which is capable of generating a voluminous cloud of white smoke without the need of a substance to oxidize carbon and Without the need of inert modifying agents.

Another object of this invention is to provide a smoke-producing mixture which forms a dense smoke by a highly exothermic reaction that slmultaneously can form a very hot slag residue, and accordingly is a Valuable adjunct in an incendiary.

The smoke-producing composition of the present invention comprises principally a reactive inorganic or metal chloride mixed with a reactive metal, preferably also with a reactive metal oxide, which react exothermically to produce a smokeforming compound. Inexpensive and readily available inorganic chlorides may thus be used in the mixture, from which organic chlorides having strategic importance for other uses can be completely omitted.

A very suitable metal chloride for the mixture is iron chloride, which can be used economically. It was found that ferric chloride could be used with finely divided zinc as a smoke-producing mixture but that it is far better to use a reactive metal oxide, such as zinc oxide, and a finely diamended April 30, 1928; 370 O. G. 757) vided reactive metal, such as grained aluminum, magnesium or zinc dust, together with the-iron chloride. Other reactive metal chlorides, for example, tin tetrachloride, may be used in the same manner; but these substances are mor expensive. In general, the reactive elementary metal and the metal constituent of the reactive oxide should be higher in the electromotive series than the metal constituent of the reactive metal chloride, and-the elementary metal should be at least as high as the metal constituent of the oxide in the electromotive series. Also, the major proportion of the mixture by weight should be the metal chloride ingredient.

Since the reaction involved is highly exothermic, all that is required to start the reaction is a suitable starting or igniting mixture, for example, such as has been used in smoke and incendiary grenades and bombs.

As an example, the following composition has been found to perform satisfactorily in grenades:

' Per cent Secondary grained aluminum .7.0 Zinc oxide 40.0 Iron chloride (FeCls) anhydrous 53.0

Experiments show that a harmless zinc chloride smoke results from such a mixture. The mixture is stable prior to ignition and does not require any other type of component. However, it is desirable to have the metal chloride anhydrous for the best performance.

If desired, other ingredients may be added in minor proportions tothe composition. Oxidizing salts, like potassium chlorate, sodium chlorate or barium nitrate, may be added. A small amount of more or less inert substances, such as magnesium carbonate and calcium carbonate, may be present in the mixture. Reaction-modifying substances, such as ammonium chloride or sodium bicarbonate, may be employed. The mixture may also contain an organic dye, if it is desired to produce a colored smoke. It may also contain a combustible material, such as powdered sulfur; and it may contain a binder, such as dextrin or an oil. Although no organic chloride is necessary in the mixture, a small proportion of organic chloride, such as hexachlorethane, may be used together with the metal chloride.

In the filling of a smoke candle or smoke pot, a. portion of the mixture may be used with modifying agents to delay the reaction. However, when used in conjunction with an incendiary, the mixture can be used satisfactorily without any modifying agent.

Furthermore, when the mixture is to be used in a smoke grenade or smoke pot for producing a low-temperature smoke slowly, the metal constituent of the metal oxide may be the same as the finely divided metal which is mixed with the chloride of another metal as, for example, in a mixture of zinc dust and zinc oxide with ferric chloride. 7

It is to be noted that there are numerous combinations of ingredients which could be selected for use in the mixture and that the uantities of ingredients may be varied, but the composi-: tions are considered as embodying the present invention when they are characterized by the presence of a metal chloride, an oxide of a metal higher in the electromotive series than the metal constituent of the chloride, and a finely divided metal higher in the electromotive series than the metal constituent of the oxide. It is to be understood that various other modifications come within the spirit and scope of the invention.

What is claimed is:

1. A smoke-producing mixture comprising a major proportion by weight of a reactive metal chloride, an oxide of a metal higher in the elec- .tromotive series than the metal constituent of the chloride and a finely divided metal higher in the electromotive series than the metal constituent of the oxide, said oxide and said chloride being principal reactants.

2. A smoke-producing mixture comprising a major proportion by weight of reactive iron chloride, grained aluminum and zinc oxide.

3. A smoke-producing mixture comprising a major Proportion by weight of reactive ferric chloride, zinc dust and Zinc oxide.

4. A smoke-producing mixture comprising a major proportion by weight of reactive anhydrous ferric chloride, grained aluminum and zinc oxide.

5. A smoke-producing mixture comprising about 7% by weight of grained aluminum, about 40% by weight of zinc oxide and about 53% by 20 weight of anhydrous ferric chloride.

LEO FINKELSTEIN. HERVE-Y B. ELKINS.

US2409201A 1943-11-25 1943-11-25 Smoke-producing mixture Expired - Lifetime US2409201A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2409201A US2409201A (en) 1943-11-25 1943-11-25 Smoke-producing mixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2409201A US2409201A (en) 1943-11-25 1943-11-25 Smoke-producing mixture

Publications (1)

Publication Number Publication Date
US2409201A true US2409201A (en) 1946-10-15

Family

ID=24035968

Family Applications (1)

Application Number Title Priority Date Filing Date
US2409201A Expired - Lifetime US2409201A (en) 1943-11-25 1943-11-25 Smoke-producing mixture

Country Status (1)

Country Link
US (1) US2409201A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614083A (en) * 1944-10-13 1952-10-14 Jr John C Bailar Metal chloride screening smoke mixture
US3329624A (en) * 1963-01-16 1967-07-04 Hooker Chemical Corp Composition for producing smoke
USRE29142E (en) * 1968-11-21 1977-02-22 Consiglio Nazionale Delle Richerche Combustible compositions for generating aerosols, particularly suitable for cloud modification and weather control and aerosolization process
US4363679A (en) * 1979-12-22 1982-12-14 Dynamit Nobel Aktiengesellschaft Use of zinc peroxide as oxidant for explosives and pyrotechnical mixtures
US4608102A (en) * 1984-11-14 1986-08-26 Omark Industries, Inc. Primer composition

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614083A (en) * 1944-10-13 1952-10-14 Jr John C Bailar Metal chloride screening smoke mixture
US3329624A (en) * 1963-01-16 1967-07-04 Hooker Chemical Corp Composition for producing smoke
USRE29142E (en) * 1968-11-21 1977-02-22 Consiglio Nazionale Delle Richerche Combustible compositions for generating aerosols, particularly suitable for cloud modification and weather control and aerosolization process
US4363679A (en) * 1979-12-22 1982-12-14 Dynamit Nobel Aktiengesellschaft Use of zinc peroxide as oxidant for explosives and pyrotechnical mixtures
US4608102A (en) * 1984-11-14 1986-08-26 Omark Industries, Inc. Primer composition

Similar Documents

Publication Publication Date Title
US3437534A (en) Explosive composition containing aluminum,potassium perchlorate,and sulfur or red phosphorus
Steinhauser et al. “Green” pyrotechnics: a chemists' challenge
US4697521A (en) Method for opaquing visible and infrared radiance and smoke-producing ammunition which implements this method
US5388519A (en) Low toxicity primer composition
US4428292A (en) High temperature exploding bridge wire detonator and explosive composition
US5460671A (en) Ignition compositions for inflator gas generators
US3745077A (en) Thermit composition and method of making
US20050189053A1 (en) Bismuth oxide primer composition
US2972948A (en) Shaped charge projectile
Matyáš et al. Primary explosives
US5417160A (en) Lead-free priming mixture for percussion primer
US3293187A (en) Oxygen-generating product
Ellern Military and civilian pyrotechnics
US5466315A (en) Non-toxic primer for center-fire cartridges
US3126305A (en) Ignition compositions comprising boron containing salts
US3160537A (en) Heating composition
US4237787A (en) Incendiary projectile
US3468730A (en) Propellant composition containing an organic tetrazole derivative and metal oxidizer
US5154782A (en) Obscuring and nontoxic smoke compositions
US5522320A (en) Low-toxicity obscuring smoke formulation
US2970900A (en) Priming composition
US4608102A (en) Primer composition
US2410801A (en) Igniting composition
US2480141A (en) Primer mixture
Koch Metal-fluorocarbon based energetic materials